CN214366386U

CN214366386U - Variable compression ratio engine

Info

Publication number: CN214366386U
Application number: CN202120021547.5U
Authority: CN
Inventors: 邓铁桥; 蔡金沛; 何国华; 赖信华
Original assignee: Yinlong New Energy Co Ltd; Zhuhai Guangtong Automobile Co Ltd
Current assignee: Yinlong New Energy Co Ltd; Zhuhai Guangtong Automobile Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-10-08
Anticipated expiration: 2031-01-05

Abstract

The utility model discloses a variable compression ratio engine, including the casing, the casing is provided with the piston, and the piston is connected with connecting rod structure, and connecting rod structure's bottom is provided with the bent axle, and the structural swing joint of connecting rod has drive structure, and drive structure drive connecting rod structure removes the upper and lower dead center that changes the piston motion to change the compression ratio of engine. The utility model provides a variable compression ratio engine adjusts the compression ratio at any time according to the load and the operating mode condition that the engine is different, through the length of many connecting rod structure control engine connecting rods, influences the position of upper and lower dead center on the piston to change the combustion chamber volume, finally change the engine compression ratio. Under the condition of the same displacement, the high-speed high-.

Description

Variable compression ratio engine

Technical Field

The utility model relates to a variable compression ratio engine technical field, in particular to variable compression ratio engine.

Background

The automobile engine still has no breakthrough technology to date, namely the variable compression ratio technology, most of the engines of all mass production in the world are fixed compression ratio engines, the performance of the fixed compression ratio engines is stable and reliable, the new performance of the technical innovation is perfect after decades, but the defects are obvious, namely the fixed compression ratio can not adapt to all working condition requirements, so that the indexes of energy efficiency, emission and the like can not be further improved, although various major host factories strive for breakthrough in the aspect of variable compression ratio, various solutions of variable compression ratio have been proposed, but the technical problems and bottlenecks which can not be breakthrough are encountered, either the structure is complex and the control is difficult, the cost is too high, or the stability is poor and mass production cannot be carried out, the common engine structure is a single-connecting-rod single-crankshaft structure, although the engine structure is simple and efficient, the defects exist, and the fixed compression ratio is not changed, the dynamic property, the economical efficiency, the emission property and the like of the engine cannot be well unified.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a variable compression ratio engine solves the big technical problem who compresses the ratio and adjust the structure complicacy of current compressor that mentions in the background art.

In order to achieve the above object, the present invention provides a specific technical solution of a variable compression ratio engine as follows:

the utility model provides a variable compression ratio engine, includes the casing, and the casing is provided with the piston, and the piston is connected with the connecting rod structure, and the bottom of connecting rod structure is provided with the bent axle, and the last swing joint of connecting rod structure has drive structure, thereby drive structure drive connecting rod structure removes the change that changes the piston motion's upper and lower dead center position changes the compression ratio of engine.

Further, the driving structure comprises a motor assembly, the motor assembly is connected with a driving shaft, the driving shaft is movably connected with a driven shaft, a first base is fixedly connected onto the driven shaft, and the driven shaft is rotatably connected with a second base.

Furthermore, a containing hole is formed in the shell, the motor assembly comprises a motor body, the motor body is fixed to the containing hole, one end of the driving structure is fixed to the shell, the tail end of the driving structure is movably connected with the connecting rod structure, and therefore the driving structure drives the connecting rod structure to change.

Further, the motor assembly further comprises a connecting plate, the connecting plate is arranged on the bottom surface of the motor body relatively, a through hole is formed in the connecting plate, a first connecting piece is arranged in the through hole, and the first connecting piece is connected with the shaft core.

Further, the driving shaft comprises a shaft body, and an inner spline arranged on the inner wall of the shaft body is matched with an outer spline arranged on the sliding groove, so that the shaft core is inserted into the driving shaft and drives the driving shaft to rotate.

Further, the bottom of axle body is provided with the second fixed plate, and the second fixed plate is connected with the second connecting piece, and second connecting piece and driven shaft are connected.

Further, the driven shaft includes the sleeve, and telescopic end connection has the third fixed plate, third fixed plate and second connecting piece swing joint, is provided with first limiting plate on the telescopic outer wall, and telescopic tip is provided with the second limiting plate, and first limiting plate and second limiting plate are formed with the holding portion, are provided with first base on the holding portion.

Furthermore, a first pin shaft is arranged on the first base and is rotatably connected with the connecting rod structure.

Further, the connecting rod structure comprises a plurality of connecting rods, and the connecting rods are hinged to each other.

Further, the connecting rod structure comprises a first connecting rod, one end of the first connecting rod is hinged to a second connecting rod, a round hole is formed in the first connecting rod, a fourth connecting rod is connected to the round hole in a rotating mode, the fourth connecting rod is hinged to a third connecting rod, and the end portion of the second connecting rod is hinged to the end portion of the third connecting rod.

Furthermore, a first connecting hole is formed in the first connecting rod, a second connecting hole is formed in the hinged position of the second connecting rod and the third connecting rod, a third connecting hole is formed in the hinged position of the second connecting rod and the third connecting rod, and a fourth connecting hole is formed in the hinged position of the third connecting rod and the fourth connecting rod.

Furthermore, the first connecting hole is connected with the piston hole, the second connecting hole is connected with the first pin shaft, and the fourth connecting hole is connected with the second pin shaft.

The utility model discloses a variable compression ratio engine has following advantage: the utility model provides a variable compression ratio engine adjusts the compression ratio at any time according to the load and the operating mode condition that the engine is different, through the length of many connecting rod structure control engine connecting rods, influences the position of upper and lower dead center on the piston to change the combustion chamber volume, finally change the engine compression ratio. Under the condition of the same displacement, the high-speed high-.

Drawings

FIG. 1 is a schematic structural view of a variable compression ratio engine according to the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic structural view of a driving structure of the variable compression ratio engine of the present invention;

fig. 4 is an exploded schematic view of the driving structure of the variable compression ratio engine of the present invention;

fig. 5 is a schematic view of a link structure of the variable compression ratio engine of the present invention.

Description of reference numerals: 1. a housing; 2. a piston; 3. a connecting rod structure; 31. a first connection hole; 311. a circular hole; 32. a fourth connection hole; 33. a second connection hole; 34. a third connection hole; 4. a crankshaft; 5. a drive structure; 51. a motor assembly; 511. a motor body; 512. a connecting plate; 513. a first connecting member; 52. a shaft core; 521. a first fixing plate; 522. an external spline; 53. a drive shaft; 531. a shaft body; 532. a second fixing plate; 533. a second connecting member; 54. a driven shaft; 541. a third fixing plate; 542. a sleeve; 543. a first limit plate; 544. a second limiting plate; 55. a first base; 551. a first pin shaft; 56. a second base; 561. a second pin shaft; 562. a threaded rod.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the present invention will be described in further detail with reference to the accompanying drawings 1-5.

As shown in fig. 1, the utility model provides a variable compression ratio engine, including casing 1, casing 1 is provided with piston 2, and piston 2 is connected with connecting rod structure 3, and connecting rod structure 3's bottom is provided with bent axle 4, and swing joint has drive structure 5 on the connecting rod structure 3, and drive structure 5 drives connecting rod structure 3's structural change and changes the upper and lower dead center of piston 2 motion to change the compression ratio of engine.

As shown in fig. 2 to 4, the driving structure 5 includes a motor assembly 51, the motor assembly 51 is connected with a driving shaft 53, the driving shaft 53 is movably connected with a driven shaft 54, a first base 55 is fixedly connected to the driven shaft 54, the driven shaft 54 is rotatably connected with a second base 56, the motor assembly 51 rotates to drive the rotation of the shaft core 52, the shaft core 52 drives the driving shaft 53 to rotate, the driving shaft 53 drives the driven shaft 54 to rotate, the first base 55 moves along with the driven shaft 54, the second base 56 moves in a telescopic manner relative to the base 55, and therefore the change of the connecting rod structure 3 is achieved.

Housing 1 is last to be seted up and to hold the hole, and motor element 51 includes motor body 511, and motor body 511 fixes on holding the hole to fix drive structure 5's one end on housing 1, drive structure 5's end and connecting rod structure 3 move the connection, thereby realize drive structure 5 drive connecting rod structure 3's structural change.

The motor assembly 51 further comprises a connecting plate 512, the connecting plate 512 is oppositely arranged on the bottom surface of the motor body 511, a through hole is formed in the connecting plate 512, a first connecting piece 513 is arranged in the through hole, and the first connecting piece 513 is connected with the shaft core 52.

The first connecting member 513 is a cross-shaped bracket provided with four connecting ends, wherein the connecting plate 512 is rotatably connected with two of the connecting ends, and the shaft core 52 is rotatably connected with the other two connecting ends.

A first fixing plate 521 is fixedly connected to an end portion of the shaft core 52, the first fixing plate 521 includes a bottom plate, and two ends of the bottom plate are symmetrically provided with connecting plates 512, so that the other two connecting ends of the cross bracket are connected with the first fixing plate 521. The connecting plate 512, the first connecting member 513 and the first fixing plate 521 constitute a universal joint.

The outer wall of the core 52 is provided with external splines 522 so that the core 52 and the axle shaft 53 are slidably coupled.

The driving shaft 53 includes a shaft body 531, and an inner spline engaged with the slide groove 522 is provided on an inner wall of the shaft body 531, so that the shaft core 52 is inserted into the driving shaft 53, and the shaft core 52 drives the driving shaft 53 to rotate.

The bottom end of the shaft body 531 is provided with a second fixing plate 532, the second fixing plate 532 is connected with a second connecting member 533, and the second connecting member 533 is connected with the driven shaft 54.

The second connecting member 533 and the first connecting member 513 are both cross-shaped brackets, and also have the same connecting function, and the connecting members have different structures and the same function, and both include four connecting ends, so that the movement in different directions is realized.

Driven shaft 54 includes sleeve 542, the end connection of sleeve 542 has third fixed plate 541, third fixed plate 541 and second connecting piece 533 swing joint, be provided with first limiting plate 543 on the outer wall of sleeve 542, the tip of sleeve 542 is provided with second limiting plate 544, first limiting plate 543 and second limiting plate 544 are formed with the holding portion, be provided with first base 55 on the holding portion, be provided with the through-hole on the first base 55, the through-hole cover is established on the outer wall of sleeve 542, first base 55 removes along with from the moving axis 54, first base 55 does not rotate along with driven shaft 54, be provided with first round pin axle 551 on the first base 55, first round pin axle 551 and connecting rod structure 3 rotate and connect, thereby drive structure 5 drives the connection structure motion.

Be equipped with the screw hole in the sleeve 542, be connected with second base 56 screw pair, second base 56 includes threaded rod 562, and threaded rod 562 and sleeve 542 are connected, are provided with second round pin axle 561 on one side of threaded rod 562.

As shown in fig. 5, the link structure 3 includes a plurality of links, which are hingedly disposed. Preferably, the utility model provides an in the embodiment, link structure 3 includes first connecting rod, and the one end of first connecting rod articulates there is the second connecting rod, is provided with round hole 311 on the first connecting rod, and round hole 311 rotates and is connected with the fourth connecting rod, and the fourth connecting rod articulates there is the third connecting rod, and the tip of second connecting rod and third connecting rod is articulated to form four-bar linkage 3.

The first connecting rod is provided with a first connecting hole 31, the hinge joint of the second connecting rod and the third connecting rod is provided with a second connecting hole 33, the hinge joint of the second connecting rod and the third connecting rod is provided with a third connecting hole 34, and the hinge joint of the third connecting rod and the fourth connecting rod is provided with a fourth connecting hole 32.

The first connecting hole 31 is connected with the piston 2 through a hole, the second connecting hole 33 is connected with the first pin 551, and the fourth connecting hole 32 is connected with the second pin 561, so that the driving and driving connecting rod structure 3 is driven to move up and down, the distance between the first connecting hole 31 and the third connecting hole 34 is changed, the positions of the upper dead point and the lower dead point of the piston 2 are changed, the volume of a combustion chamber is changed, and finally the compression ratio of an engine is changed. Preferably, the distance from the first connecting hole 31 to the third connecting hole 34 is controlled by the rotation speed of the motor, so that the compression ratio is controlled from 8:1 to 14: 1.

When the compression ratio needs to be changed, the motor assembly 51 rotates to drive the driving structure 5 to rotate, then the driven shaft 54 moves around one end of the second base 56, and because the driven shaft 54 is connected with the first base 55 in a free sleeve manner, but the limiting plate on the driven shaft 54 limits the first base 55 to move left and right, the first base 55 and the driven shaft 54 translate left and right, the distance between the first base 55 and the second base 56 changes, namely, the lengths of the second connecting hole 33 to the fourth connecting hole 32 of the four-bar linkage mechanism change.

When the engine runs stably and the compression ratio is stabilized at a certain value, the motor assembly 51 does not work, and the first base 55 and the second base 56 are controlled to move along with the four-bar linkage to move in a plane without interfering the normal running of the engine.

The utility model provides a variable compression ratio engine solves the engine pressure boost and from inhaling the contradiction between the nature. Because the rotating speed of the turbocharged engine is always too low when the turbocharged engine starts, the boost degree and the torque rise slowly, so-called boost hysteresis is formed, and the acceleration of the automobile in low-speed running is slow. The supercharging function of the turbine can be acted only after the engine is accelerated to a certain rotating speed, and the compression ratio can be adjusted at any time according to different loads and working conditions of the engine. The principle is to lower the compression ratio at high load to prevent knocking and to raise the compression ratio at low load to improve fuel economy. The application of the variable compression ratio technology can enable the dynamic property, the economical efficiency, the emission property and the like of the engine to be better unified. It also makes the overall size of the engine smaller, thereby reducing the limited installation space on the vehicle. Under the condition of the same displacement, the high-speed high-.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. The variable compression ratio engine is characterized by comprising a shell (1), wherein the shell (1) is provided with a piston (2), the piston (2) is connected with a connecting rod structure (3), the bottom end of the connecting rod structure (3) is provided with a crankshaft (4), the connecting rod structure (3) is movably connected with a driving structure (5), and the driving structure (5) drives the connecting rod structure (3) to change the upper dead point and the lower dead point of the movement of the piston (2) so as to change the compression ratio of the engine.

2. Variable compression ratio engine according to claim 1, characterized in that the driving structure (5) comprises an electric motor assembly (51), the electric motor assembly (51) being connected to a driving shaft (53), the driving shaft (53) being movably connected to a driven shaft (54), the driven shaft (54) being fixedly connected to a first base (55), the driven shaft (54) being rotatably connected to a second base (56).

3. The variable compression ratio engine according to claim 2, characterized in that the housing (1) is provided with a receiving hole, the motor assembly (51) comprises a motor body (511), the motor body (511) is fixed on the receiving hole so as to fix one end of the driving structure (5) on the housing (1), and the tail end of the driving structure (5) is movably connected with the connecting rod structure (3) so as to realize that the driving structure (5) drives the connecting rod structure (3).

4. The variable compression ratio engine according to claim 3, characterized in that the motor assembly (51) further comprises a connecting plate (512), the connecting plate (512) is oppositely arranged on the bottom surface of the motor body (511), a through hole is formed in the connecting plate (512), a first connecting piece (513) is arranged in the through hole, and the first connecting piece (513) is connected with the shaft core (52).

5. The variable compression ratio engine according to claim 4, characterized in that the drive shaft (53) comprises a shaft body (531), and an inner spline provided on an inner wall of the shaft body (531) is engaged with an outer spline provided on the sliding groove (522) so that the shaft core (52) is inserted into the drive shaft (53), and the shaft core (52) drives the drive shaft (53) to rotate.

6. The variable compression ratio engine according to claim 5, characterized in that the bottom end of the shaft body (531) is provided with a second fixing plate (532), the second fixing plate (532) is connected with a second connecting member (533), and the second connecting member (533) is connected with the driven shaft (54).

7. The variable compression ratio engine according to claim 2, characterized in that the driven shaft (54) comprises a sleeve (542), a third fixing plate (541) is connected to an end of the sleeve (542), the third fixing plate (541) is movably connected with the second connecting member (533), a first limiting plate (543) is disposed on an outer wall of the sleeve (542), a second limiting plate (544) is disposed on an end of the sleeve (542), a receiving portion is formed by the first limiting plate (543) and the second limiting plate (544), and a first base (55) is disposed on the receiving portion.

8. Variable compression ratio engine according to claim 7, characterised in that the first base (55) is provided with a first pin (551), the first pin (551) being rotatably connected to the link structure (3).

9. Variable compression ratio engine according to claim 8, characterized in that a threaded through hole is provided in the sleeve (542), to which the second base (56) is connected, the second base (56) comprising a threaded rod (562), on one side of which the second pin (561) is provided.

10. Variable compression ratio engine according to claim 1, characterized in that the connecting rod arrangement (3) comprises a plurality of connecting rods, which are arranged hingedly.

11. Variable compression ratio engine according to claim 10, characterized in that the connecting rod arrangement (3) comprises a first connecting rod, one end of which is hinged to a second connecting rod, the first connecting rod being provided with a circular hole (311), the circular hole (311) being rotatably connected to a fourth connecting rod, which is hinged to a third connecting rod, the second connecting rod being hinged to the end of the third connecting rod.

12. The variable compression ratio engine according to claim 11, wherein the first link is provided with a first connecting hole (31), the second link and the third link are provided with a second connecting hole (33) at the joint, the second link and the third link are provided with a third connecting hole (34) at the joint, and the third link and the fourth link are provided with a fourth connecting hole (32) at the joint.

13. Variable compression ratio engine according to claim 12, characterized in that the first connection hole (31) is connected to the piston (2), the second connection hole (33) is connected to the first pin (551), and the fourth connection hole (32) is connected to the second pin (561).